Glycohemoglobin (GHb)

GHb (Glycohemoglobin) Test, HbA1c (Hemoglobin A1c), Hemoglobin A1c

Results

Glycohemoglobin is a blood test that checks the amount of sugar (glucose) bound to hemoglobin. The result is shown as a percentage and may be compared with a number value. Your A1c level may be reported without a total glycohemoglobin value. Your doctor will have your test results in 1 to 2 days.

Normal

Normal values vary from lab to lab, depending on the test method used.

Glycohemoglobin (GHb)

Glycohemoglobin A1c:	4.5%–5.7%
Total glycohemoglobin:	5.3%–7.5%

The Canadian Diabetes Association (CDA) recommends that people with diabetes have an A1c level less than 7%. If levels are greater than 8%, treatment may need to be changed.

Comparison of hemoglobin A1c and plasma glucose levels

Hemoglobin A1c %	Average plasma glucose (mg/dL)	Average plasma glucose (mmol/L)
6	135	7.5
7	170	9.5
8	205	11.5
9	240	13.5
10	275	15.5
11	310	17.5
12	345	19.5

High values

A glycohemoglobin A1c level above 8% means that your diabetes has been poorly controlled over the last 2 to 3 months.

Some medical conditions can increase A1c levels, but the results may still be within a normal range. These conditions include Cushing's syndrome, pheochromocytoma, and polycystic ovary syndrome (PCOS).

Corticosteroid treatment increases the A1c level.

A1c levels may be higher in children and teens with diabetes.

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Author:	Jan Nissl, RN, BS	Last Updated: August 18, 2006
Medical Review:	Adam Husney, MD - Family Medicine Caroline S. Rhoads, MD - Internal Medicine David C.W. Lau, MD, PhD, FRCPC - Endocrinology & Metabolism
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